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What do plant and animal cells share, and how big are they?

Biology · Years 11–12 · Full version

Open its page: Plant and animal cells
A cell from a green part of a plant, drawn to scale, 80 µm long. A cellulose cell wall surrounds the cell membrane. A thin layer of cytoplasm lines the membrane and holds a nucleus, lens-shaped green chloroplasts and small mitochondria. A large central vacuole fills most of the cell. The scale bar stands for 20 µm.

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How a lesson runs.

One sample lesson, from watching to working on your own. Try one of its questions: choose an answer, check it, or ask for a hint.

  1. Get readyCheck tens and ones first
  2. Watch52 + 36, worked by splitting
  3. Together43 + 20 bottle tops
  4. With help41 + 37, step by step
  5. On my own14 questions, three hints each
  6. Error review5 common errors to look out for

On my own · Question 13 of 14

Rhea works out 43 + 20 and writes 65. Which of these is her mistake?

Common error

Check the right answer and this card names the mistake the question looks for, with its fix.

Adds two-digit numbers with and without regrouping · Starting · Years 1–2

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Explore five complete Year 11 and 12 lessons.Physics, Chemistry, Biology, English and Mathematics · full working and four print editions

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